After you solder in the new wires, shrink wrap them...remember to slide the shrink wrap tube onto the wires first before you connect them!

Also, if you've upgraded & properly installed new sockets, they should have no trouble handling higher wattage bulbs...I've done precisely this on both of my W124s and have been quite pleased with the improved lighting performance

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Best regards, Michael
'92 500E
'88 300TE